With an estimated 20.4% of California drivers lacking auto insurance in 2023, the odds of sharing the road with one are high.1
If an uninsured driver has ever hit you, you likely questioned whether they drove recklessly because they had nothing to lose.
The research backs that up, showing that uninsured drivers are statistically more dangerous for reasons far beyond a simple lapse in coverage.
Often, the same financial desperation that leads to a dropped policy also leads to bald tires, risky driving, and a panic-driven instinct to run when things go wrong.
Key Takeaways
- Uninsured drivers are more likely to cause crashes. A peer-reviewed study of crash data found their probability of causing an accident was 34 percentage points higher.
- The study used Swedish data from 2006 to 2010. It shows a pattern, not the reason behind it.
- Five factors likely drive the added risk: risky driving habits, poorly maintained vehicles, fleeing the scene, age and finances, and money stress.
- About 1 in 5 California drivers was uninsured in 2023, the eighth-highest rate in the country.
- Uninsured drivers often can’t pay for the harm they cause, so your own uninsured motorist (UM) coverage is the main safety net.
- If you drive uninsured and sustain an injury, Prop 213 can block you from recovering pain and suffering damages.
Do Uninsured Drivers Cause More Accidents?
Yes. In fact, a peer-reviewed study analyzing Swedish crash records found that uninsured drivers are 34 percentage points more likely to cause a crash than insured drivers.2
While experts trace this danger to five key issues—reckless driving, deferred car repairs, money stress, age, and fleeing the scene—it helps to start with what the data shows.
What the Swedish Study Found
Sherzod Yarmukhamedov, a researcher at the Swedish National Road and Transport Research Institute, compared insured and uninsured drivers using claims records from Sweden’s motor insurers for 2006 to 2010.2
He reported three main results:
- Uninsured drivers were 34 percentage points more likely to be the at-fault driver.
- Uninsured drivers ages 25 to 34 posed the highest risk.
Across all drivers, vehicles 11 years or older were tied to more at-fault crashes than vehicles under 5 years old.
What the Study Doesn’t Tell Us
Every statistic has limits. This one has four:
- It’s Swedish data. We couldn’t find a comparable peer-reviewed study built on California crash records.
- It’s older data. The records cover 2006 to 2010.
- It only counts crashes that happened. The sample included vehicles already involved in accidents, so it measures who caused a crash, not how often each group crashes.
- It shows a gap, not a cause. The study doesn’t prove why uninsured drivers are riskier.
The five reasons below draw on that study plus U.S. and California traffic-safety research. Where the evidence is thin, we say so.
1. Uninsured Drivers Often Break Other Traffic Laws Too
If someone ignores the law requiring insurance, they may also be ignoring other rules of the road. While we can’t prove this with absolute certainty, crash data strongly points to a pattern of risky behavior.
Suspended and Unlicensed Drivers Cause More Crashes
Not having insurance isn’t the same as driving without a license. We found no study that matches the two in California crash data, but the related research is hard to ignore.
A California DMV researcher analyzed 23 years of California fatal crashes and found that:
- Drivers with suspended or revoked licenses were 160% more likely to cause a deadly crash than drivers with valid licenses.
- Unlicensed drivers had 173% higher odds.
- Both groups were more likely to be at fault every single year of that 23-year span.3
Keep in mind, these are motorists who already broke the rules to get behind the wheel.
Some lost their licenses for reckless driving or racking up too many tickets. Others lost them for things unrelated to driving, like unpaid child support.3
Do Uninsured Drivers Take Bigger Risks?
Driving without insurance is a bet that nothing will go wrong. Drivers willing to gamble on coverage may also gamble on speeding, running red lights, or weaving through traffic.
To be fair, we didn’t find a study proving this exact link. Still, it’s a very reasonable inference based on how people behave on the road.
Wouldn't Uninsured Drivers Drive Extra Carefully?
Some argue they would. After all, getting pulled over without insurance can mean massive fines, a suspended license, or even getting your car impounded.
There’s actually a bit of truth to this idea. Earlier research on suspended drivers, summarized in the same California study, noted they tend to drive less often and more carefully to avoid police detection.
But the crash data cuts the other way. Even with that caution, suspended and unlicensed drivers were more likely to be at fault in fatal crashes every year of the 23-year study.3
2. Money Problems Lead to Poorly Maintained Vehicles
A driver who can’t afford an insurance premium may also put off repairs. Routine maintenance like replacing worn tires is easy to ignore until something goes wrong.
Worn Tires Add Stopping Distance
Picture a rainy morning commute on the 10. Traffic bunches up, and the car ahead brakes hard.
When AAA and the Automobile Club of Southern California’s Automotive Research Center tested tires worn to 4/32 of an inch on wet pavement, the results were striking.
Compared to new tires, the worn set needed an average of 87 more feet to stop a passenger car from highway speed. Their handling ability also dropped by about a third.4
To put that in perspective, 87 feet is longer than a full-size semi-trailer. A driver on worn tires could smash into stopped traffic that a vehicle with fresh tires would have avoided.
Older Vehicles are Linked to Higher Crash Rates
The Swedish study found vehicles 11 years or older were tied to more at-fault crashes than vehicles under five years old.2
That result covered all drivers, not only uninsured ones. The study also didn’t track vehicle maintenance.
So the link to uninsured drivers is an inference. Many insured drivers are also rolling around on worn tires.
This factor raises risk for anyone on the road. Deferred maintenance may just be more common when money is already tight.
3. Uninsured Drivers are More Likely to Flee the Scene
Fleeing isn’t unique to uninsured drivers, but the urge to run is easy to understand when a motorist has no coverage to pay for the damage they cause.
Record Hit-and-Run Rates Point to Unlicensed Drivers
The AAA Foundation’s March 2026 study found a troubling pattern:
- 15% of police-reported crashes in 2023 involved a fleeing driver, the highest share in any recent year.
- 1 in 4 pedestrians and nearly as many cyclists killed that year were hit by a hit-and-run driver.
- Among known hit-and-run drivers in fatal crashes, 40% had no valid license, and more than half were driving a vehicle not registered in their name.5
While AAA didn’t track insurance status specifically, drivers facing stacked penalties for having no license, no insurance, or both may see running as their only way out.
AAA’s research did note, however, that drivers are less likely to flee when they expect to be caught.5
Hit-and-Run Drivers Endanger LA Pedestrians and Cyclists
Traffic crashes killed 290 people in the city of Los Angeles in 2025, and more than 150 were pedestrians, according to LAPD data.6
In unincorporated LA County communities such as East Los Angeles and Florence-Firestone, hit-and-run drivers were behind 30% of pedestrian deaths from 2015 to 2024.7
When a driver bolts after a minor collision, their sudden, unsafe moves to escape can turn a simple fender-bender into a tragedy. People on foot and on bikes have the least protection in these situations.
A pedestrian accident or bicycle accident involving a fleeing driver leaves victims searching for coverage elsewhere.
4. Age and Finances Overlap with Higher Crash Risk
The drivers most likely to go without insurance overlap with drivers who carry higher crash risk, at least in the data we have.
What the Study Found About Age
Among uninsured drivers, ages 25 to 34 posed a higher crash risk than uninsured drivers 65 and older.2
The gaps between age groups were modest. The author suggests younger drivers may simply have less driving skill, which tends to improve with time.
Which Generations are Most Likely to Drive Uninsured?
A TransUnion survey released in August 2026 found 30% of Gen Z drivers, 17% of Millennials, 7% of Gen X, and 1% of Baby Boomers had owned or driven an uninsured vehicle in the past six months.8
The 25-to-34 bracket straddles the two youngest, most uninsured groups.
Two caveats apply here:
- The numbers are self-reported.
- TransUnion’s research excludes California data.
But money isn’t the whole story. When asked why they went without coverage:
- 28% of uninsured Gen Z drivers chose not to renew
- 26% said they couldn’t pay
- 22% forgot to pay on time
- 20% were dropped by their insurer8
Pair limited driving experience with tight finances and a lapse in coverage, and the pattern in the Swedish study starts to make sense.
5. Financial Stress Impairs Driver Attention and Judgment
This is the least-proven reason on the list. We found no study that tests it in uninsured drivers. It’s a hypothesis built from related behavioral research.
Trying to Avoid Police Takes Attention Off the Road
Let’s go back to the driver trying to stay off the radar. They constantly check the rearview mirror for patrol cars, brake hard at yellow lights, and crawl at the speed limit in the fast lane.
These habits just swap one risk for another. A driver watching for police isn’t watching traffic flow, and a sudden stop can easily surprise the driver behind them.
How Money Worries Reduce Driving Focus
A 2024 review of 61 driver-stress studies found that high stress adds a heavy mental load, which can weaken attention, judgment, and decision-making.9
While that review focused on traffic-related stress rather than financial worries, separate research points directly to the cognitive impact of money problems.
In a well-known 2013 experiment, lower-income participants who were reminded of an expensive car repair did worse on reasoning and attention tasks.10
Because other researchers challenged how that study handled income data, those findings are best treated as suggestive.11
But the underlying logic is easy to grasp. Picture a driver worried about rent merging onto the 110 at rush hour. Part of their attention may be on the bills instead of the brake lights ahead of them.
How Many California Drivers are Uninsured?
About one in five. The Insurance Research Council estimated 20.4% of California drivers were uninsured in 2023, the eighth-highest rate in the country. The national rate was 15.4%.1
How the IRC Estimates Uninsured Motorist Crash Rates
Be careful with that number. The IRC estimates its uninsured rate from the ratio of uninsured motorist claims to bodily injury claims.1
It’s a prevalence estimate. It tells us how common uninsured drivers are, not how often they cause collisions.
In fact, no U.S. dataset strictly measures crash rates based on a driver’s insurance status. However, ignoring insurance requirements often overlaps with other dangerous behavior.
What is Causing the Spike in Uninsured Drivers?
Nationally, the estimated rate climbed from 11.6% in 2019 to 14.3% in 2020 and reached 15.4% in 2023.1
California’s steep cost of living is an obvious culprit. When auto premiums spike, some drivers drop their coverage just to afford groceries or pay their Los Angeles rent.
But TransUnion’s survey suggests that isn’t the whole story, since 28% of uninsured Gen Z drivers simply chose not to renew.8
How an Accident With an Uninsured Driver Changes Your Injury Claim
When an uninsured driver causes a crash in California, you typically have to rely on your own policy to cover your hospital bills and vehicle repairs.
While you have the right to sue the at-fault driver personally, people driving without basic liability coverage rarely have the assets or cash to pay a judgment.
Suing the Driver Personally is a Long Shot
California requires all motorists to carry at least $30,000 per person for injuries and $15,000 for property damage.12
When a driver ignores those basic minimums, they usually don’t have a hidden trust fund or real estate you can attach a lien to.
Insider Accident Lawyers always runs a thorough asset check on the at-fault driver just in case.
But realistically, many victims end up relying on their own UM coverage instead. An experienced car accident lawyer can step in to negotiate that claim to ensure your own insurer doesn’t lowball your payout.
Prop 213 Limits Compensation for Uninsured Motorists
If you’re the uninsured one, the law is strict. Under Proposition 213, now Civil Code § 3333.4, a driver or vehicle owner without required insurance can’t recover non-economic damages after a crash.13
That means you can’t receive a single dollar to compensate for pain, suffering, inconvenience, or physical impairment, even if the other driver was 100% at fault.
If they blow a red light and leave you with a chronic neck injury, you can only recover out-of-pocket expenses. Those include your medical bills, property damage, and lost wages.
One exception applies when the at-fault driver is later convicted of DUI.
How Uninsured Motorist Coverage Protects You
Imagine getting sideswiped on the 110 during rush hour. You pull over, swap details, and quickly realize the driver who hit you doesn’t carry a dime of auto insurance.
That’s where Uninsured Motorist Bodily Injury (UMBI) coverage takes over.
Instead of trying to squeeze a settlement out of a driver with zero collectible assets, you bypass them and file the claim directly with your own provider.
Your UM policy replaces the liability insurance the at-fault driver failed to buy. It steps in to pay for your urgent care bills, ongoing physical therapy, and the paychecks you miss while recovering at home.
California law actually requires auto insurers to offer you this protection upfront. You’d have to sign a written waiver to reject it.
Our uninsured driver collision guide explains how such claims work.
Will Filing a UM Claim Raise Your Rates?
Many drivers hesitate to use their UM coverage because they assume their monthly premiums will immediately spike.
Under California law, that can’t happen. Proposition 103 prohibits your insurance company from penalizing you financially for a crash someone else caused. Your rates stay the same.
A surcharge only hits your record if the adjuster determines you were 51% or more at fault for the collision.14
But keep your guard up. Just because you’re dealing with your own insurer doesn’t mean they’d want to hand over a fair settlement.
Claims adjusters often feed your medical records into insurance valuation software to generate artificially low settlement ranges. They classify things like whiplash or muscle strains as “subjective” injuries to justify a minimal payout before negotiations even start.
If your provider relies on an algorithm to undervalue your treatment or sends you a boilerplate claim denial, that’s not a final legal ruling.
You have every right to push back on the adjuster’s data, challenge the software’s math, and demand compensation that reflects your actual recovery.
FAQs
Who pays when you're hit by an uninsured driver?
Often, it’s your own coverage, if you have it: uninsured motorist coverage, MedPay, health insurance, or collision. You can also sue the at-fault driver or other liable parties, such as an employer or vehicle owner. What fits depends on your policy and the facts of the crash. Our uninsured driver collision guide walks through each option.
What state has the highest rate of uninsured motorists?
Mississippi, at 28.2% in 2023. New Mexico (24.1%) and Washington, D.C. (23.1%) followed. California ranked eighth at 20.4%.1
Should I reject uninsured motorist coverage?
That’s your call, and worth a talk with your insurance agent or an attorney. Consider the numbers: about 1 in 5 California drivers was uninsured in 2023.1 UM coverage is what pays if one of them hurts you. California insurers must offer it, but you can decline in writing.
Is uninsured motorist coverage better than collision coverage?
They cover different losses. UM bodily injury coverage pays for your injuries when an uninsured driver hurts you. Collision coverage pays for damage to your car regardless of who caused the crash.14 Neither replaces the other.
Does uninsured motorist coverage apply to hit-and-run crashes?
Often, yes. California generally treats unidentified hit-and-run drivers as uninsured for UM purposes, though policies set conditions, such as reporting deadlines. Check your policy or ask a lawyer.
Uninsured Drivers Put More Than Money at Risk
It’s a frustrating reality that drivers without insurance are more likely to cause crashes. Between neglected vehicle maintenance, riskier driving, and a higher chance of hit-and-runs, the danger is always out there.
With about 1 in 5 drivers lacking coverage in California, you’re sharing the 405, the 10, and your neighborhood streets with thousands of motorists who can’t pay for the wrecks they cause.
Taking a hit from an uninsured driver can feel like a financial dead end. But you shouldn’t have to empty your savings to cover hospital bills and car repairs because of someone else’s mistake.
Read our guide on what to do after an uninsured driver collision, or contact Insider Accident Lawyers for a free case evaluation. Our attorneys know where to look to uncover the compensation you deserve.
References
- “Facts + Statistics: Uninsured Motorists.” Triple-I, 2026, www.iii.org/fact-statistic/facts-statistics-uninsured-motorists. Accessed 21 Sept. 2026.
- Yarmukhamedov, Sherzod. “How Risky Are Uninsured Drivers?” Journal of Transportation Safety & Security, vol. 12, no. 2, 2020, pp. 263–74, www.tandfonline.com/doi/full/10.1080/19439962.2018.1477892. Accessed 21 Sept. 2026.
- Brar, Sukhvir S. “Estimating the Over-Involvement of Suspended, Revoked, and Unlicensed Drivers as At-Fault Drivers in California Fatal Crashes.” Journal of Safety Research, vol. 50, Sept. 2014, pp. 53–58, www.sciencedirect.com/science/article/abs/pii/S0022437514000413. Accessed 21 Sept. 2026.
- “Tread Lightly: Worn Tires Put Drivers at Risk.” AAA Newsroom, 7 June 2018, newsroom.aaa.com/2018/06/tread-lightly-worn-tires-drivers-risk/. Accessed 21 Sept. 2026.
- “Fatal Hit-and-Run Crashes Reach Record High, AAA Foundation Study Finds.” AAA Newsroom, 11 Mar. 2026, newsroom.aaa.com/2026/03/fatal-hit-and-run-crashes-reach-record-high-aaa-foundation-study-finds/. Accessed 21 Sept. 2026.
- “Once Again, More People Were Killed in Collisions on LA Streets Than by Homicide Last Year.” LAist, 12 Feb. 2026, laist.com/transportation/traffic-collisions-vision-zero. Accessed 21 Sept. 2026.
- “Policies for Livable Active Communities and Environments (PLACE): Data and Reports.” Los Angeles County Department of Public Health, publichealth.lacounty.gov/place/data_reports.htm. Accessed 21 Sept. 2026.
- “Nearly One-Third of Gen Z Drivers Reported Owning or Driving an Uninsured Vehicle in the Past Six Months.” TransUnion Newsroom, 11 Aug. 2026, newsroom.transunion.com/nearly-one-third-of-gen-z-drivers-reported-owning-or-driving-an-uninsured-vehicle-in-the-past-six-months/. Accessed 21 Sept. 2026.
- Ni, Jie, et al. “The Impacts of the Traffic Situation, Road Conditions, and Driving Environment on Driver Stress: A Systematic Review.” Transportation Research Part F: Traffic Psychology and Behaviour, vol. 103, May 2024, pp. 141–62, www.sciencedirect.com/science/article/abs/pii/S1369847824000809. Accessed 21 Sept. 2026.
- Mani, Anandi, et al. “Poverty Impedes Cognitive Function.” Science, vol. 341, no. 6149, 30 Aug. 2013, pp. 976–80, pubmed.ncbi.nlm.nih.gov/23990553/. Accessed 21 Sept. 2026.
- Wicherts, Jelte M., and Anne Z. Scholten. “Comment on ‘Poverty Impedes Cognitive Function.’” Science, vol. 342, no. 6163, 6 Dec. 2013, p. 1169, www.science.org/doi/10.1126/science.1246680. Accessed 21 Sept. 2026.
- “Auto Insurance Requirements.” California Department of Motor Vehicles, 2025, www.dmv.ca.gov/portal/vehicle-registration/insurance-requirements/. Accessed 21 Sept. 2026.
- “Civil Code Section 3333.4.” California Legislative Information, leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=3333.4. Accessed 21 Sept. 2026.
- “Automobile Insurance.” California Department of Insurance, 2025, www.insurance.ca.gov/01-consumers/105-type/95-guides/01-auto/upload/IG-Auto-Insurance-Updated-020525.pdf. Accessed 21 Sept. 2026.
About the Author
Jerome Garo is a Legal Content Writer at Insider Accident Lawyers, where he turns personal injury law into clear, practical guidance for people recovering after an accident. He has written legal content for U.S. law firms and spent years writing/editing search-focused articles across tech, healthcare, finance, and other complex fields. With a background in communication, copyediting, and SEO, Jerome cuts through legal jargon and explains what readers need to know in plain English.
